Also, he says, “If you can assign this sort of unexpected emotion to an animal, it’s effective. I think we don’t expect our animals to be grumpy, so as a result you have that novelty factor at work too.”

Dooley engages in consumer neuroscience, which seeks to use scientific discoveries about the brain to determine the motivations behind consumer choices.

It’s not hard to find evidence of the level of engagement humans have with images of cats and dogs. A simple Google search on cat images yields 590,000,000 results, of which 6,790,000 results are of just Grumpy Cat. The same search for dog images yields 556,000,000 results, 4,700,000 of which are of grumpy dogs.

Dooley says that cute animals have always been an effective marketing tool, a practice he attributes to both the “anthropomorphizing of animals and the fact that humans are attracted to larger eyes, which animals have.”

Brad Duchaine, Associate Professor Department of Psychological and Brain Sciences at Dartmouth College in Hanover, New Hampshire who works on face processing, says in an interview that in these cases of Grumpy Cat and Earl, “The eyes are driving a lot of the signal.”

“When we look at a cat face we’re applying the same things we do when looking at a human face,” he says. “The eyes are narrowed and the mouth is curved downward. We read that as the cat having a kind of complex emotion like we have. We’re attracted to it the way we would be to a grumpy faced human or a kid making that face we’d think it was funny.”

Looking at the photos of Earl, Duchaine exclaims, “Oh, yeah, that puppy is grumpy. And it looks like an old man too.”

“I think it’s the eyes and the mouth driving it,” he says. “You can cover up everything else and with just the eyes and the mouth you get the signal of anger, grumpiness, pretty clearly.”

Another factor that may be driving the almost physical pull of these animal images is the that humans are attracted to larger eyes thanks to a built in trigger that sensitizes us to our young.

“It’s a signal for youth and babies have large eyes relative to their heads,” Duchaine explains. “That’s something you see in all juvenile animals and it’s something we find appealing, maybe because we’ve been designed to respond to juveniles – caretaking.”

While the grumpy animal trend is unlikely to last very long, human nature, marketing and neuroscience combine to keep these favorites in the back of our minds.

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“This is just an interesting meme that will eventually get overworked and die back to a lower level,” Dooley concludes. “I think at the moment, whenever you’ve got one of these memes that sort of explode they have a period of strong growth and eventually the shelf-life becomes a little bit more limited. Not that they ever go away.”

Paul Nelson, creator of News and Cats on Tumblr has resisted the siren song of the grumpy, "I never have posted Grumpy Cat or anything related to him, though I admit some of the memes are good for a chuckle. But I prefer cat posts that are good-natured fun and, I guess at the heart of it, more positive in that they celebrate the hilarity of cats and cat ownership."

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